Some upload forms set a floor as well as a ceiling — a 40 KB scan gets turned away for being under 100 KB. This pads the file up to the size you name without touching a single visible page.
How to increase the size of a PDF
Add the PDF that is being rejected as too small.
Name the size it needs to reach.
Download the padded PDF — the pages are untouched.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: pad pdf, minimum file size, make pdf bigger, pdf too small. It is the same tool whichever way you found it.
Questions about increase pdf size
Why would anyone need to make a PDF bigger?
Because some upload forms set a floor as well as a ceiling, and a 40 KB scan gets turned away for being under 100 KB. This pads the file up to the size you name.
Does padding change how the document looks?
No. Not a single visible page is touched — the pages you had are the pages you get, at a larger file size.
Is the PDF uploaded?
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.
Other PDF tools
Compress PDF — Shrink a heavy PDF without leaving your browser.
Compress Image — Shrink a JPG, PNG or WebP — or hit an exact KB limit.
Merge PDF — Combine any number of PDFs, in the order you choose.
Split PDF — Pull out a page range, or break a file into parts.
Organise Pages — Reorder, rotate and delete pages while you watch.
Rotate PDF — Turn every page, or just the ones you name.